# CVE-2024-45216: Apache Solr: Authentication bypass possible using a fake URL Path ending

- Exploited (CISA KEV): no
- Published: 2024-10-16
- CVSS: 9.8 CRITICAL (v3.1)
- EPSS: 92.7% (100th percentile)
- CWE: CWE-287

Improper Authentication vulnerability in Apache Solr.

Solr instances using the PKIAuthenticationPlugin, which is enabled by default when Solr Authentication is used, are vulnerable to Authentication bypass.
A fake ending at the end of any Solr API URL path, will allow requests to skip Authentication while maintaining the API contract with the original URL Path.
This fake ending looks like an unprotected API path, however it is stripped off internally after authentication but before API routing.


This issue affects Apache Solr: from 5.3.0 before 8.11.4, from 9.0.0 before 9.7.0.

Users are recommended to upgrade to version 9.7.0, or 8.11.4, which fix the issue.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Blocks by default | 2025-01-06 | 82 |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2024-11-12 | 27 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2025-01-06 · new · rule 3bda15acd73a4b55a5f60cd2b3e5e46e · default Block
  > Apache Solr - Auth Bypass - CVE:CVE-2024-45216. Previous action: Log. New action: Block. New Detection
  Source: https://developers.cloudflare.com/changelog/post/2025-01-06-waf-release/

### F5

- 2024-11-12 · new · rule 200013100
  > Added: signature 200013100 "Apache Solr Authentication Bypass" (Authentication/Authorization Attacks, risk High), systems: Apache. References: CVE-2024-45216.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2025-01-21 · updated · rule 200013100
  > Updated: signature 200013100 "Apache Solr Authentication Bypass" (Authentication/Authorization Attacks, risk High), systems: Apache. References: CVE-2024-45216.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2025-03-11 · updated · rule 200013100
  > Updated: signature 200013100 "Apache Solr Authentication Bypass" (Authentication/Authorization Attacks, risk High), systems: Apache. References: CVE-2024-45216.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: passed (0 of 1 requests blocked), template CVE-2024-45216, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: passed (0 of 1 requests blocked), template CVE-2024-45216, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2024-45216 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2024-45216